Mon, 22 Apr 2013 08:26:16 +0100 Christian Urban updated and small modification
Fri, 05 Apr 2013 09:18:17 +0100 Christian Urban polished the intro
Mon, 01 Apr 2013 21:38:53 +0100 Christian Urban added paper by Kozen on Hoare-logics and Kleene algebras
Mon, 01 Apr 2013 18:15:00 +0100 Christian Urban fixed counterexample according to def in Chap 8
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